Worthy of gratitude to the donor!
Worth most to someone who appreciates them and may even use them from time to time.
It isn't realistic to prserve everything that is well made and useful, especially if it is worn so it loses accuracy, but some things are just nice to own, and then one day along comes just the job you need them for, or the opportunity to pass them on.
Like me you may well have 1" and 2" digital micrometers, but are your really likley to buy bigger than that for the amount you would use them? No, but one day those ones will come in handy.
Neil